Eudolf hagee



PATENTED JAN. 12, 1904.

R. HAGER. ELECTRODE.

APPLIUATION FILED m. 31, 1901.

H0 MODEL.

UNITED STATES Patented anuary 12, 1904.

PATENT OFFICE.

ELECTRODE.

SPECIFICATION forming part of Letters Patent No. 749,185, dated January12, 1904..

Application filed January 31, 1901. Serial No. 45,514. (No model.)

To all whom it 'moty concern:

Be it known that I,RUDOLE HAGER, engineer, of Friedrichsruherstrasse 5,Halensee, near the city of Berlin, in the Empire of Germany,haveinvented certain new and useful Improvements in and Connected withElectrodes; and I do hereby declare that the following is a full, clear,and exact description of the same.

My invention relates to electrodes for electric accumulators, and moreespecially to electrodes prepared and formed according to the so-calledPlant method, a process in which, as known, two or more plates of lead(electrodes) are placed in a bath of diluted sulfuric acid and anelectric current is conducted through the bath, whereupon the positiveelectrode becomes covered with a layer of dioxid of lead. This saidmethod of treatment when suitably repeated and the electrodes oftenreversed produces the formation upon the electrodes known, ashereinbefore indicated, under the name of Plant.

In this connection my improvements consist in a peculiar shape or formbeing imparted to groove or channel shaped elements and each of thechannels soldered. to a lead strip in known manner. An electrode soformed when taken into use has been to an extent unsatisfactory in sofar as the same is not durable, as in the formation of the layer as wellas in the charging and discharging of such electrodes tensions areproduced in the lead substance which have been found to effect adeformation of the separate channels, whereby a breaking off of the leadsponge or dioxid of lead on the surface of these channels can takeplace. I have now found that these deformations and the above-mentionedinjurious consequences can be obviated if instead of each separatechannel being caused to consist of an entirely complete square or acomplete ring or a complete ellipse the said ring is at one point slitor when the separate rills, channels, or grooves are constructed in theform of a spiral. In my improved device each channel can in the formingof the layer, in the charging, or in the discharging so expand orcontract that injurious tensions which might cause :the deformation ofthe channel no longer occur.

My invention is illustrated in the accompanying drawings, in which-Figure 1 is an axial vertical section on the line A B of Fig. 2 througha number of electrode-plates constructed according to my invention andarranged coaxial to each other.

Fig. 2 is a corresponding plan which shows.

the arrangement of the separate plates to each other. Fig. 3 shows inplan a number of variously-shaped groove or channel shaped piecescombined to form electrode-plates. Figs. 4:, 5, and 6 show inperspective sectional portions of variously-shaped channel-plates forelectrodes constructed according to my invention.

In the drawings the electrode-plates a b 0 are arranged coaxially toeach other. The plate (0 forms, therefore, the casing or envelop of theplate 6, the latter being of considerably less diameter than the former.The same proportion as to size exists between the plate 6 on the oneside and the plate 0 on the other. Each of these three plates (0 b 0consists of a more or less large number of channels a b 0, having fiatsmooth walls a b 0 and a b 0 Both walls a a or Z2 Z2 are arranged tomeet at an angle which is preferably under ninety degrees, but which,however, may be ninety degrees or more. Furthermore, each of the platesare connected by upright lead strips d, and it should be noted that eachof the lead strips d is connected to each of the channels. Instead ofarranging these lead strips (Z in an upright position, they mayevidently be given any other position desired. To these strips d otherstrips for leading ofi the current (not shown in the drawings) areconnected, on which strips the terminals or clamps are arranged.Furthermore, each separate channel a I) 0, although possessing thecircular shape, does not form a continuous circle, but is open at onepoint, each channel being separated or divided, as shown at 9, wherebythe advantage hereinbefore described is attained.

In place of the previously-described channel-plates-a b 0' with smoothwalls I may also employ a modificationviz., channels with corrugated orslanting wallssuch as are, for instance, shown in Figs. 4 and 6. Inthese channels the undulated elevations or ribs f meet at an angle, or,as shown in Fig. 6, have a trough-like shape. In Fig. 3 furthermodifications of such channel-plates are shown. This figure illustratesa channel composed of various parts I, II, III, IV, and V. To obviatemisunderstanding, I will remark that a combination of the parts I, II,III, IV, and V is not carried out on one and the same channel inpractice. This figure has only the purpose of showing that either one ofthe channel-pieces I II III IV V, as also any similar channel-shapedpieces, can be employed for the production of square, round, or spiralelectrode-plates, the important feature being that a number ofspirally-shaped channelplates are employed to form a single body ofoptional section. These spiral channel-plates are placed together in amanner similar to that shown in Fig. 1, the separate channelplates withthe stiffening-strips being, as hereinbefore indicated, solderedtogether, whereby firmness and solidity become imparted to the whole. Asthe plates are only used for the Plant process, a coating of thechannels with the filling mass does not take place.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is

1. An electrode of the Plant form comprising separate plates coaxiallyarranged, each plate being-composed of a series of channelshaped platesarranged one above the other, each channebshaped plate being providedwith a slit extending transversely of the channel therein.

2. An electrode of the Plant form comprising separate plates coaxiallyarranged, each plate being composed of a series of channelshaped platesarranged one above the other, each channel-shaped plate being providedwith a slit extending transversely of the channel therein, and leadstrips connecting each series of channel-shaped plates.

3. An electrode-plate consisting of a series of channel-shaped platesarranged one above the other, each channel-shaped plate being providedwith a slit extending transversely of the channel therein.

In witness whereof I have hereunto signed my name this 24th day ofSeptember, 1900, in the presence of two subscribing witnesses.

- RUDOLF HAGER.

Witnesses:

HENRY HASPER, WOLDEMAR HAUPT.

